what is the demand for commodity that posses identical utilities called

Toyin

law of diminishing utility...as the quantity consumed of a commodity increases,the utility derived from each successive unit goes on decreasing... condition___ consumption of other commodities remaining the same.

Malik

sorry it's...Law of diminishing marginal utility

Malik

demand for commodities that posses identical utilities?
The commodities having identical utilities are perfect substitutes...and the demand for such type of commodities is called "Competitive Demand".